Container for packaging

Abstract

To provide a packaging container that can easily be opened while making it difficult for a lid to come off from a container body without greatly changing a shape of a conventional product.SOLUTION: A packaging container 1 includes a lid 3 to cover a container body 2, in which peripheral edges 24 and 33 are polygonal, and one of the lid 3 and the container body 2 is provided with a fitting protrusion 37 protruding inwardly or outwardly and engaged with the other to maintain a lid closed state near a corner of the peripheral edge 33, and the fitting protrusion 37 has an appropriate length in a circumferential direction of the container and is arranged so as to straddle the corner, and among the fitting protrusions 37, a length of the fitting protrusion 37 arranged at one corner is made shorter than a length of the fitting protrusion 37 arranged at the other corner.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a packaging container that facilitates the lid-opening operation.

Background Art

[0002] Recently, due to the influence of the novel coronavirus, the number of people eating out has decreased. As a countermeasure, it has been heard that an increasing number of restaurants are starting to offer takeout such as boxed lunches. Boxed lunches are often sold in containers made of thin synthetic resin (plastic) sheets. Such containers are light and convenient to carry. For example, in order to prevent the lid from accidentally coming off when carrying and the contents from spilling out, there are some that are provided with a fitting convex portion at the peripheral edge of the lid and are designed to fit into a fitting concave portion provided in the container body so that the lid can be closed.

[0003] If the fitting force is increased so that the lid does not come off, conversely, more force is required for the lid-opening operation, making it tend to be difficult to open. Also, if the fitting force is increased too much, when opening the lid, too much force may be applied, and the contents may spill out due to the reaction at the same time as opening.

[0004] Therefore, for example, Patent Document 1 below discloses a container that facilitates the lid-opening operation. Patent Document 1 below discloses a packaging container in which the structure of the fitting portion for fitting the container body and the lid is a structure having at least one of an inner fitting and an outer fitting. In the packaging container, one of the container body or the lid is provided with a knob piece portion provided outside the fitting portion, and an inclined surface provided on the surface of the knob piece portion and inclined so as to project toward the outside of the container and toward the other side of the container body or the lid. On the other side of the container body or the lid, there is a pressing piece portion facing the knob piece portion in the closed lid state, and on the outside of the container of the pressing piece portion, there is an outer bulging portion that bulges toward the knob piece portion and whose tip can slide on the inclined surface. On the inside of the container of the pressing piece portion, there is an inner bulging portion that bulges toward the knob piece portion and whose tip abuts slidably on the inclined surface in the closed lid state. By pinching the knob piece portion and the pressing piece portion, the lid opening operation can be easily performed.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] The container disclosed in Patent Document 1 above can achieve both good fitting performance and lid opening performance. However, the shapes of the knob piece portion and the pressing piece portion are complex, and there are manufacturing problems such as difficulty in manufacturing the mold. Also, when stacking and packing the container body or the lid alone, there is a problem that the shapes of the knob piece portion and the pressing piece portion are three-dimensional and bulky.

[0007] Therefore, an object of the present invention is to provide a packaging container that can easily perform the lid opening operation while making it difficult for the lid to come off from the container body without significantly changing the shape from the conventional product.

Means for Solving the Problems

[0008] The packaging container according to one embodiment of the present invention includes a lid that covers the container body, and is a packaging container having a polygonal peripheral edge portion, The end portion of the peripheral wall surface of the container body on the lid side is formed in a gable shape, and the top thereof is arranged in a straight line in a side view to form a peripheral edge portion, On one of the lid and the container body, a fitting convex portion that protrudes inward or outward and engages with the other to maintain the closed lid state is provided near the corner portion of the peripheral edge portion. The fitting convex portion has an appropriate length in the circumferential direction of the container and straddles the corner portion. continuously It is arranged, and among the fitting convex portions, the length of the fitting convex portion arranged at one corner portion is shorter than the length of the fitting convex portion arranged at the other corner portion.

[0009] In the packaging container of the above-described embodiment, the fitting convex portion is provided near the corner portion of the peripheral edge portion of the container, and among the fitting convex portions, the length of the fitting convex portion arranged at one corner portion is shorter than the length of the fitting convex portion arranged at the other corner portion. Therefore, it is easy to open the lid from this location, and at the same time, the fitting state of the lid and the container body is maintained by the other fitting convex portions when the lid is closed, and the lid can be made difficult to come off.

[0010] The packaging container according to another embodiment of the present invention includes a lid that covers the container body, and the peripheral edge portion , an isosceles trapezoid with the upper base shorter than the lower base is a trapezoidal packaging container, The end portion of the peripheral wall surface of the lid on the container body side is formed into a planar covering surface portion that projects horizontally outward and a vertical surface portion with its tip bent, and the covering surface portion is arranged in a straight line in a side view to form a peripheral edge portion, On one of the lid and the container body, fitting convex portions that protrude inside or outside the container and engage with the other to maintain the closed lid state are provided at each corner portion of the peripheral edge portion. The fitting convex portions have an appropriate length in the circumferential direction of the container and straddle the corner portion. continuously It is arranged, and the length of the fitting convex portion arranged at one corner portion on the upper base side of the peripheral edge portion is shorter than the length of the fitting convex portion arranged at the other corner portion.

[0011] In the packaging container of the above-described other embodiment, the peripheral edge portion is trapezoidal, and the length of the fitting convex portion arranged at one corner portion on the upper base side of the container is shorter than the length of the fitting convex portion arranged at the other corner portion. Therefore, it becomes easy to open the lid from this location, and when opening the lid, the container is less likely to shake due to recoil and the contents are less likely to spill out. Also, the fitting state of the lid and the container body is maintained by the other fitting convex portions when the lid is closed, and the lid can be made difficult to come off.

[0012] In the packaging containers of both of the above forms, it is preferable to provide a fitting convex portion on one of the lid body or the container body, and a fitting concave portion into which the fitting convex portion fits on the other of the lid body or the container body. Since it has a structure in which the fitting convex portion fits into the fitting concave portion, it becomes easy to maintain the fitting state, and the lid body is difficult to come off, resulting in a container.

[0013] In the packaging containers of both of the above forms, a tab portion in the shape of a slice extending outward can be provided near the corner portion where the fitting convex portion having a short length is arranged. By pinching the tab portion and performing the lid opening operation, the lid opening operation becomes easier in conjunction with the fitting convex portion having a short length.

Brief Description of the Drawings

[0014]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Embodiments for Carrying Out the Invention

[0015] Hereinafter, an embodiment of the packaging container of the present invention will be described with reference to the drawings.

[0016] As shown in FIGS. 1 to 3, the packaging container 1 according to an embodiment of the present invention is integrally formed with a container body 2 and a lid body 3 via a hinge portion 4 provided at a longitudinal edge portion. The peripheral edge portion has a trapezoidal shape, more specifically, a vertically long isosceles trapezoidal shape. With the lower base side as the bottom surface portion 22a, as shown in FIG. 2, it can be placed vertically while being slightly inclined toward the back side. The container 1 may use the left back surface portion 21 shown in FIG. 2 as the bottom surface portion. Further, the container 1 may be a separate body in which the container body 2 and the lid body 3 are separated without providing the hinge portion 4.

[0017] The packaging container 1 is formed in a vertically long box shape, and although not particularly limited, it can be sized to be about 50 mm to 300 mm in height, 30 mm to 150 mm in width, and 20 mm to 150 mm in depth. It is suitable for accommodating vertically long contents, for example, food products such as shrimp tempura, fried shrimp, and vegetable sticks. However, the contents are not limited to these.

[0018] The shape of the peripheral edge portion of the packaging container 1 is not limited to the above shape and may be a polygonal shape, for example, a triangular shape, a quadrangular shape such as a square shape, a rectangular shape, a parallelogram shape, a pentagonal shape, a hexagonal shape, an octagonal shape, or the like.

[0019] As shown in FIG. 4, the container body 2 includes a back surface portion 21 and a peripheral wall surface portion 22 that rises vertically with respect to the back surface portion 21 so as to surround the back surface portion 21. As shown in FIG. 2, one surface of the peripheral wall surface portion 22 is the bottom surface portion 22a. As shown in FIG. 3, the back surface portion 21 is formed such that the lower half is deep and the upper half is shallow, and the lower half is formed to be about two to three times deeper than the upper half. More specifically, based on FIG. 3, from the upper edge portion to near 3 / 4 of the total height, it has a gentle inclined surface shape, from near 3 / 4 of the total height to near half of the total height, it has a vertical surface shape, from near half of the total height to near 1 / 3 of the total height, it has a slightly steep inclined surface shape, and from near 1 / 3 of the total height to the lower edge portion, it has a gentle inclined surface shape. By adopting such a shape of the back surface portion 21, it is possible to suppress the sinking of the contents and enable a voluminous arrangement, and also to stabilize it when placed vertically.

[0020] On the back surface portion 21 and the peripheral wall surface portion 22, as shown in FIG. 1 or FIG. 2, rib portions 23 in the form of convex strips or concave grooves are formed to enhance the rigidity of the container body 2 and to make it difficult for the contents accommodated inside to shift and move. In the present embodiment, as shown in FIG. 1, nine rib portions 23 are formed in parallel in the lower half of the container body 2 and two rib portions 23 are formed in parallel in the upper half in the lateral direction extending from the back surface portion 21 to the peripheral wall surface portion 22, and four rib portions 23 are formed in parallel in the vertical direction extending from the upper edge portion of the back surface portion 21 to the rib portions 23 in the lateral direction provided in the upper half. Further, near the center of the bottom surface portion 22a, rib portions 23 extending in the front-rear direction are also provided and arranged in parallel in four rows.

[0021] As shown in FIG. 4, the peripheral edge portion 24 of the peripheral wall surface portion 22 is formed by folding it back in an inverted U shape outside the main body to form a trapezoidal opening. The peripheral edge portion 24 will be described in more detail with reference to FIG. 5. In the description, it will be described in the orientation of FIG. 5. The upper side of the peripheral wall surface portion 22 is bent in a crank shape so as to expand outside the main body, and its upper end portion is formed as a gently inclined surface that slopes upward toward the outside of the main body. Further, its tip portion is bent downward to form a top portion and is formed as a somewhat steep inclined surface that slopes downward and protrudes upward in an obtuse angle shape as a gable-shaped upper end surface portion 24a. The tip portion thereof is further bent downward to provide a vertical surface portion 25 in the form of a vertical surface. By forming the upper end surface portion 24a in a gable shape, the rigidity of the peripheral edge portion 24 is improved, and during the lid-opening operation Peripheral edge portion 24 the deformation is suppressed, so that the scattering of the contents can be prevented and it becomes easier to open the lid. The lower end portion of the vertical surface portion 25 is formed so as to gradually expand outward from the main body in a curved or arc shape, and its tip portion is formed in the form of a vertical surface facing downward. Further, a flange portion 26 that projects horizontally outside the main body is provided at the lower end portion thereof.

[0022] A knob portion 27 extending in a tongue shape is provided on a part of the flange portion 26 (the upper left side in FIG. 1 in the present embodiment) to make it easier to open the container 1. On the surface of the knob portion 27, convex portions or concave portions in a mesh shape (oblique lattice shape) are provided to reinforce the knob portion 27 and to make it difficult to slip when pinched with fingertips.

[0023] A fitting recess 28 is provided near a part of the vertical surface 25, for example, near at least two corners as shown in FIG. 6. In the present embodiment, six fitting recesses 28 are provided in total at the four corners and on both sides near the intermediate part in the height direction. Each fitting recess 28 is a recess having a trapezoidal cross-section recessed inside the main body, and a fitting convex part 37 described later can enter and lock therein so that the lid body 3 can be closed. Each fitting recess 28 has an appropriate length in the circumferential direction of the container, and the fitting recesses 28 arranged at the respective corners are arranged so as to straddle the corners.

[0024] As shown in FIGS. 1 to 4, the lid body 3 has a deformed quadrangular frustum shape that bulges on the front side, and a flat top surface portion 31 having a vertically long rectangular shape in a front view is disposed so as to be biased upward. Around the top surface portion 31, an inclined wall surface portion 32 having an inclined surface that inclines toward the back side is provided.

[0025] The peripheral edge portion 33 of the wall surface portion 32 is formed so as to cover the peripheral edge portion 24 of the container main body 2 when the lid body 3 is placed on the container main body 2. The peripheral edge portion 33 will be described in more detail with reference to FIG. 7. In the description, the orientation in FIG. 7 will be used. A flat covering surface portion 33a that projects laterally from the lower end portion of the wall surface portion 32 is provided so as to cover the upper end surface portion 24a. At the tip of the covering surface portion 33a, a vertical surface portion 34 that faces downward is provided, and at the lower end thereof, a flange portion 35 that projects horizontally to the outside of the lid body is provided.

[0026] A knob portion 36 that extends in a tongue shape is provided on a part of the flange portion 35 (the upper right side in FIG. 1 in the present embodiment) so that the container 1 can be easily opened. On the surface of the knob portion 36, a mesh-shaped (oblique lattice-shaped) convex portion or concave portion is provided to reinforce the knob portion 36 and make it difficult to slip when pinched with fingertips. The knob portion 36 of the lid body 3 is arranged so as to overlap the knob portion 27 of the container main body 2 when the lid is closed, and it is preferably arranged so as to be in a displaced position when overlapped. By doing so, the tips of both knob portions 27 and 36 are easy to pinch.

[0027] A fitting convex portion 37 is provided near a part of the vertical surface 34, for example, near at least two corners. In this embodiment, the fitting convex portions 37 are provided at a total of six locations, namely, at the four corners and on both sides near the intermediate portion in the height direction, and are configured to fit into the fitting concave portions 28 provided on the container body 2. Each fitting convex portion 37 is a convex portion having an inverted mountain-shaped cross section protruding inside the lid body, and is configured to fit into the corresponding fitting concave portion 28 so that the lid body 3 can be locked to the container body 2 to close the lid. Each fitting convex portion 37 has an appropriate length in the circumferential direction of the container, and is substantially the same length or slightly shorter than the corresponding fitting concave portion 28. The fitting convex portions 37 arranged at each corner are arranged so as to straddle the corner, and it is preferable that the left and right sides have substantially the same length with the corner as the intermediate portion.

[0028] Among the fitting convex portions 37 provided at the corners, the length of the fitting convex portion 37 arranged at one corner (the upper right side in FIG. 1 in this embodiment) is made shorter than the lengths of the fitting convex portions 37 arranged at the other corners. The lengths of the fitting convex portions 37 arranged at the other corners may be the same or different. By doing so, it becomes easier to perform the opening operation from the corner with the shorter length. The short fitting convex portion 37 is preferably about 40% to 80%, particularly 50% to 70%, and further 60% to 65% of the length of the other fitting convex portions 37.

[0029] In this embodiment, the lid body 3 is provided with the fitting convex portions 37 and the container body 2 is provided with the fitting concave portions 28. Conversely, the lid body 3 may be provided with the fitting concave portions and the container body 2 may be provided with the fitting convex portions. Alternatively, the container body 2 may not be provided with the fitting concave portions 28, and the fitting convex portions 37 may be configured to lock to the tip of the flange portion 26.

[0030] Hereinafter, an example of the manufacturing method of the container body 2 and the lid body 3 will be described. The container body 2 and the lid body 3 are not particularly limited, but can be manufactured by thermoforming a synthetic resin sheet. The synthetic resin sheet may be either a thin non-foamed resin sheet or a thin foamed resin sheet, but a non-foamed resin sheet is preferable. In the case of a non-foamed resin sheet, specifically, it is preferable to use a sheet having a thickness in the range of 0.1 mm to 2.0 mm, particularly in the range of 0.2 mm to 1.2 mm. In the case of a foamed resin sheet, it is preferable to use a sheet having a thickness in the range of 0.5 mm to 4.0 mm, particularly in the range of 0.7 mm to 2.2 mm. Further, in the case of a foamed resin sheet, it is preferable that the foaming ratio is 1.05 times to 20.0 times, particularly 1.5 times to 15.0 times.

[0031] Examples of the non-foamed resin sheet include thermoplastic resin sheets such as polyolefin resin sheets such as polyethylene-based resin sheets and polypropylene-based resin sheets, polystyrene-based resin sheets, and polyester-based resin sheets such as polyethylene terephthalate-based resin sheets and modified polyethylene terephthalate-based resin sheets having heat resistance imparted thereto. Further, those capable of withstanding heating in a microwave oven, for example, heat-resistant polystyrene-based resin sheets, polypropylene-based resin sheets, and modified polyethylene terephthalate-based resin sheets having heat resistance imparted thereto may be used.

[0032] Examples of the foamed resin sheet include foamed polyolefin resin sheets, foamed polystyrene resin sheets, and foamed polyester resin sheets such as foamed polyethylene terephthalate. A laminated sheet in which synthetic resin sheets are laminated can also be used. Examples of the laminated sheet include a laminated sheet obtained by thermally laminating a resin film to a non-foamed resin sheet or a foamed resin sheet, a laminated sheet by a co-extrusion method, and a laminated sheet by an extrusion lamination method.

[0033] Biomass plastics may be used as the non-foamed resin sheet, the foamed resin sheet, and the laminated sheet. Biomass plastics refer to polymer materials obtained by chemically or biologically synthesizing substances derived from renewable organic resources as raw materials. Compared with petroleum-derived resins, biomass plastics can suppress the emission of carbon dioxide into the atmosphere and reduce the environmental load. Examples of biomass plastics include polylactic acid resin, biomass polyethylene, biomass polyethylene terephthalate, and the like.

[0034] Examples of thermoforming include vacuum forming, pressure-air forming, vacuum-pressure-air forming, hot plate forming, and the like.

[0035] The container body 2 and the lid 3 may be colored such as black or white, but are preferably transparent or translucent so that the inside can be visually recognized. When the container body 2 and the lid 3 are separate bodies, the lid 3 may be transparent or translucent, and the container body 2 may be opaque such as black. Further, on the surfaces of the container body 2 and the lid 3, when they are transparent or translucent, printing or engraving such as characters and patterns may be applied to the extent that it does not interfere with visibility, and ribs for reinforcement may be provided at appropriate positions, or dimpling for anti-slip may be applied. Stacking protrusions bulging in a cubic or rectangular parallelepiped shape or the like can also be provided on the container body 2 and the lid 3.

[0036] Hereinafter, an example of the usage method of the packaging container 1 will be described. For the packaging container 1, for example, the container body 2 is filled with contents such as food products, the lid 3 is rotated via the hinge portion 4, placed on the container body 2 and pressed, and each fitting convex portion 37 is inserted into and locked to the corresponding fitting concave portion 28, and the lid 3 can be used to close the container body 2.

[0037] The packaging container 1 can be placed upright on a shelf or the like at the storefront of a retail store such as a convenience store or a supermarket with the bottom surface portion 22a placed on the shelf and displayed vertically.

[0038] The packaging container 1 can be opened, for example, by pinching the grip portion 36 of the lid 3 with the thumb and index finger of the right hand and pinching the grip portion 27 of the container body 2 with the thumb and index finger of the left hand and pulling in the opposite direction.

[0039] At this time, since the fitting convex portion 37 arranged at the corner portion near the gripping portions 27 and 36 is shorter than the fitting convex portions 37 arranged at the other corner portions, the locking state can be easily released, and the packaging container 1 can be easily opened. Although it may be configured not to provide the gripping portions 27 and 36, it is preferable to provide them from the viewpoints of ease of opening and ease of recognizing the position of the short fitting convex portion 37.

[0040] The configuration modes of the above-described embodiments are not cited as limiting the present invention, and can be changed as long as the technical purposes are common, and the present invention includes such changes.

Explanation of Reference Numerals

[0041] 1 Packaging container 2 Container body 21 Rear surface portion 22 Peripheral wall surface portion 22a Bottom surface portion 23 Rib portion 24 Peripheral edge portion 25 Vertical surface portion 26 Flange portion 27 Gripping portion 28 Fitting concave portion 3 Lid body 31 Top surface portion 32 Peripheral wall surface portion 33 Peripheral edge portion 33a Covering surface portion 34 Vertical surface portion 35 Flange portion 36 Gripping portion 37 Fitting convex portion 4 Hinge portion

Claims

1. A packaging container having a lid for covering a container body and having a polygonal peripheral edge portion, wherein the end portion on the lid side of the peripheral wall surface portion of the container body is formed in a gable shape, and the top portions thereof are arranged in a straight line in a side view to form a peripheral edge portion, a fitting convex portion that protrudes inward or outward on one of the lid and the container body and locks to the other to maintain a closed state is provided near the corners of the peripheral edge portion, a fitting concave portion into which the fitting convex portion fits is provided on the other of the lid or the container body, each of the fitting convex portions provided near the corners has an appropriate length in the circumferential direction of the container and is continuously arranged so as to straddle the inflection point portion of the corner, the length of the fitting convex portion arranged at one corner is made shorter than the length of the fitting convex portion arranged at the other corners, a sliced grip portion extending outward is provided near the corner where the fitting convex portion having the shorter length is arranged, a hinge portion is provided on one side of the peripheral edge portion, A packaging container.

2. A packaging container having a lid for covering a container body and having a peripheral edge portion in the shape of an isosceles trapezoid with the upper base shorter than the lower base in a plan view, wherein the end portion on the container body side of the peripheral wall surface portion of the lid is formed into a planar covering surface portion that protrudes laterally outward and a vertical surface portion with its tip portion bent, and the covering surface portion is arranged in a straight line in a side view to form a peripheral edge portion, a fitting convex portion that protrudes inward or outward on one of the lid and the container body and locks to the other to maintain a closed state is provided at each corner of the peripheral edge portion, a fitting concave portion into which the fitting convex portion fits is provided on the other of the lid or the container body, each of the fitting convex portions provided near the corners has an appropriate length in the circumferential direction of the container and is continuously arranged so as to straddle the inflection point portion of the corner, the length of the fitting convex portion arranged at one corner on the upper base side of the peripheral edge portion is made shorter than the length of the fitting convex portion arranged at the other corners, a sliced grip portion extending outward is provided near the corner where the fitting convex portion having the shorter length is arranged, a hinge portion is provided on one side of the peripheral edge portion, A packaging container.

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